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    Assessing the Trophic Level of a Mediterranean Stream (Nif Stream, Izmir) Using Benthic Macro-Invertebrates and Environmental Variables
    (Central Fisheries Research Inst, 2019) Ozbek, Murat; Tasdemir, Ayse; Cil, Eylem Aydemir; Somek, Hasim; Yildiz, Seray
    The study was conducted in Nif Stream (Izmir) and the aims of the study are (a) to determine the benthic macro-invertebrate composition of the stream, (b) to determine environmental features of the stream, (c) to investigate the relations between the determined species and the environmental variables and (d) to assess the trophic level of the stream which was under the pressure of industry, agriculture and settlement. Samplings of macrobenthic invertebrates were performed seasonally at eight stations between October 2013 and September 2014 in addition to measuring environmental variables of the localities. 11571 specimens were investigated and totally 77 taxa were determined. Chironomidae and Oligochaeta were the higher groups in terms of species richness with 25 and 17 species, respectively. Multivariate analyses indicate that pH, Ca2+ and NO3-N were the most effective variables and explained 48.6% of the variance in the distribution and abundance of benthic macroinvertebrates in Nif Stream. Along the measured physicochemical characteristics and scores of biological indices, the upper branches of the stream have good quality water while the middle and lower parts are heavily polluted.
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    Öğe
    Assessing the trophic level of a mediterranean stream (Nif stream, İzmir) using benthic macro-invertebrates and environmental variables
    (Central Fisheries Research Inst, 2019) Ozbek, Murat; Tasdemir, Ayse; Cil, Eylem Aydemir; Somek, Hasim; Yildiz, Seray
    The study was conducted in Nif Stream (İzmir) and the aims of the study are (a) to determine the benthic macro-invertebrate composition of the stream, (b) to determine environmental features of the stream, (c) to investigate the relations between the determined species and the environmental variables and (d) to assess the trophic level of the stream which was under the pressure of industry, agriculture and settlement. Samplings of macrobenthic invertebrates were performed seasonally at eight stations between October 2013 and September 2014 in addition to measuring environmental variables of the localities. 11571 specimens were investigated and totally 77 taxa were determined. Chironomidae and Oligochaeta were the higher groups in terms of species richness with 25 and 17 species, respectively. Multivariate analyses indicate that pH, Ca2+and NO3-N were the most effective variables and explained 48.6% of the variance in the distribution and abundance of benthic macroinvertebrates in Nif Stream. Along the measured physico-chemical characteristics and scores of biological indices, the upper branches of the stream have good quality water while the middle and lower parts are heavily polluted. © 2019, Central Fisheries Research Inst. All rights reserved.
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    Bati Karadeniz Havzasi’nin Ephemeroptera (Insecta) Faunasi
    (Osman SAGDIÇ, 2022) Alyanak, Gülhan; Tasdemir, Ayse; Aydemir Çil, Eylem
    Bu çalisma, Türkiye'nin 25 nehir havzasindan biri olan Bati Karadeniz Havzasi'nin Ephemeroptera faunasini tespit etmeyi ve türün ekolojisini incelemeyi amaçlamaktadir. Bati Karadeniz Havzasinda akarsu ve göller dahil 24 istasyon belirlenmistir.Makrobentik omurgasizlardan örneklemeler Mayis 2014 ile Ekim 2015 arasinda 24 istasyonda mevsimsel olarak gerçeklestirilmis olup, ayni lokasyonlarda çevresel degiskenler ölçülmüstür. Belirlenen istasyonlardan toplanan Ephemeroptera örneklemesi sonucunda 9 familya, 19 cins ve 39 türe ait toplam 2460 birey tespit edilmistir. Ayrica çalisma alaninda tespit edilen türler saprobik sisteme uygulanarak istasyonlarin su kalitesi açisindan mevcut durumu ortaya konulmaya çalisilmistir.
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    Benthic invertebrates as ecological indicators in the rivers of the Northern Aegean Basin (Turkiye)
    (Springer, 2024) Ozbek, Murat; Cil, Eylem Aydemir; Tasdemir, Ayse; Topkara, Esat T.; Yildiz, Seray
    This study aimed to determine the water quality classes of seven rivers in the North Aegean Basin (Turkiye) according to their benthic macroinvertebrate groups. In order to determine water quality levels, water and benthos samples were taken from 17 localities in May and June 2014, and the collected material was examined. As a result, a total of 22,348 benthic macroinvertebrate individuals belonging to 47 taxonomic groups were identified. The main groups and individual numbers were as follows: Chironomidae (8948 ind.), Baetidae (3910 ind.), Oligochaeta (1715 ind.), Gammaridae (1667 ind.), Potamanthidae (1401 ind.), Asellidae (1113 ind.), Melanopsidae (968 ind.), Physidae (618 ind.), Dugesiidae (475 ind.) and Hydropsychidae (107 ind.). The relationships between benthic macroinvertebrates and environmental variables were examined by canonical analysis. The dominance, BMWP (Biological Monitoring Working Party) and ASPT (Average Score Per Taxon) indices among benthic invertebrate groups were calculated. The dominant group was Chironomidae with similar to 40%. Considering the BMWP scores, stations S2, S3, S12 and S17 were classified as polluted, station S5 was classified as unpolluted. ASPT scores indicated that station S3 was heavily polluted and S16 was the cleanest station.
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    Determination of the ecological status of an Aegean river (Turkiye) using benthic macroinvertebrates as an indicator of water quality
    (Springer, 2023) Ozbek, Murat; Aygen, Cem; Tasdemir, Ayse; Yildiz, Seray; Topkara, Esat T.; Cil, Eylem Aydemir
    Bakircay is one of the important rivers of Western Anatolia, Turkiye. The objectives of this study are (a) to determine the diversity of benthic invertebrates distributed in Bakircay, (b) to evaluate the obtained data using various biological indices, (c) to determine the interactions of species with environmental variables, and (d) to estimate the water quality level of the river using BMWP and ASPT analyses. Samplings were carried out at 15 stations between October 2017 and July 2018, seasonally. A total of 11,897 specimens belonging to 136 benthic macroinvertebrate taxa were determined. Diptera and Oligochaeta were the dominant groups with 32 (24%) and 25 taxa (18%), respectively. Station 4 has the highest species richness with 49 taxa (36%). The highest individual number (3421) was at the 14th station. Tubifex tubifex and Physella acuta have the highest dominancy (25.76%) and frequency (51.67) values, respectively. Diversity (H') values of the stations fluctuated between 1.367 (st. 13) and 3.154 (st. 12). Similarity analysis showed that the 3rd and 11th stations have the highest similarity (> 90%), while the 14th station was an outgroup and has 28% similarity ratio. BMWP and ASPT scores gave similar results, and there was no 1st class water quality in the river. On the other hand, the results of the TR-BMWP score suggested that the 1st, 4th, and 6th stations had 1st class water quality. Although some stations are classified as good conditions, the adverse effects of pollution were mainly observed in the main channel and downstream of the river.
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    Diversity of benthic macroinvertebrates and water quality of Karasu Stream (Black Sea)
    (Ege Univ, Fac Fisheries, 2021) Cil, Eylem Aydemir; Ozbek, Murat; Yardim, Oztekin; Yildiz, Seray; Tasdemir, Ayse; Rasouli, Hamidreza; Gurbuzer, Pinar
    The study was conducted in Karasu Stream (Sinop Province, Black Sea Region of Turkey). The purpose of this study is, to determine the benthic macroinvertebrate composition of the stream, together with some of its environmental characteristics (water temperature, pH and dissolved oxygen) to evaluate the trophic level of the stream. Samplings of benthic macroinvertebrates and environmental variables were performed monthly at ten stations between February 2013 and January 2014. As a result, 18260 specimens were investigated and 175 taxa were determined. Chironomidae and Oligochaeta were the higher groups in terms of species richness with 48 and 38 taxa, respectively. The BMWP and ASPT indices indicate that all the stations belong to slightly polluted (Class II) or unpolluted (Class I) water quality levels.